937w / 3 = ~312w per card. Add another 312w for the 4th 480 and it gives you 1249 watts giving you only 191w left for your CPU (I assume you're running a quad core), motherboard and your drives. Good luck. I guess if there's a blackout that hits your surrounding area then we'll know where it came from.

if you really want that overkill speed, there are 3 options for you in a motherboard for you. (and you will need a new case for it too since they are 7 pci-e slot mb's!). They all have 2 nf200 chips so you can do full 16x for all video cards. Mind you, there will be nothing left over for anything else as they take up all the slots.

1. Evga 4 way sli motherboard
2. Asus p6t7 ws supercomputer motherboard
3. you are going to have to wait for this one since it's not on the market yet, the gigabyte ga-x58a-ud9
(it' s the same as the other two but has usb 3.0 and 4 sata 3 ports)

and you will need two power supplies to power that sucker!
oh hydro bill!